mwe/events/include/timer.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

#pragma once

#include <SDL2/SDL.h>

class LoopTimer {
public:
	static LoopTimer & getInstance();
	void start();
	void update();
	double getDeltaTime() const;
	int getCurrentTime() const;
	void advanceFixedUpdate();
	double getFixedDeltaTime() const;
	void setFPS(int FPS);
	int getFPS() const;
	void enforceFrameRate();
	double getLag() const;

private:
	LoopTimer();
	int FPS = 50;
	double gameScale = 1;
	double maximumDeltaTime = 0.25;
	double deltaTime;
	double frameTargetTime = FPS / 1000;
	double fixedDeltaTime = 0.01;
	double elapsedTime;
	double elapsedFixedTime;
	double time;
	uint64_t lastFrameTime;
};